Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan.
Soft Matter. 2017 Feb 8;13(6):1116-1119. doi: 10.1039/c6sm02324j.
We found the displacement of a microbead by the oblique irradiation of UV light in pure 4-cyano-4'-pentylbiphenyl (5CB) without photo-responsive molecules. This system is very simple and a complicated experimental setup is not necessary. The displacement is observed in the nematic state of 5CB and not in the isotropic state. The distance of the displacement was proportional to the intensity of the UV light. After the irradiation was stopped, the microbead started to return to the original position. These phenomena are attributed to the thermal expansion of 5CB induced by the photo-thermal effect of polyimide coated on the glass substrate.
我们发现，在没有光响应分子的情况下，通过紫外光的斜向照射，可以使纯 4-氰基-4'-戊基联苯（5CB）中的微珠发生位移。该系统非常简单，不需要复杂的实验装置。这种位移发生在 5CB 的向列相，而不是各向同性相中。位移的距离与紫外光的强度成正比。当照射停止后，微珠开始返回原来的位置。这些现象归因于涂覆在玻璃基底上的聚酰亚胺的光热效应引起的 5CB 的热膨胀。
